package com.wzy.java;

public class test21 {
    public static void main(String[] args) {
        int[][] arr = new int[][]{{4, 5, 6, 8}, {2, 3}, {1, 6, 9}};

        System.out.println(arr.length);//输出行数
        System.out.println(arr[0].length);//输出列数
    }
}
